Faculty of Sciences and Technology (MeditBio), Ed. 8, University of Algarve, Campus de Gambelas, 8005-139 Faro, Portugal.
Faculty of Sciences and Technology (MeditBio), Ed. 8, University of Algarve, Campus de Gambelas, 8005-139 Faro, Portugal.
J Colloid Interface Sci. 2018 Dec 1;531:225-232. doi: 10.1016/j.jcis.2018.07.043. Epub 2018 Jul 19.
Diffusing wave spectroscopy (DWS) is a powerful optical technique suitable to investigate turbid samples in a nondestructive and reproducible way, providing information on the static and dynamic properties of the system. This includes the relative displacement of emulsion droplets over time and changes in the viscoelastic properties. Here, novel and promising cellulose-based oil-in-water (O/W) emulsions were prepared and studied, for the first time, by DWS. Cellulose plays the role of a novel eco-friendly emulsifying agent. The hydrolysis time of cellulose was observed to affect the average size of the emulsion droplets and their stability; the longer the hydrolysis time, the more dispersed and stable the emulsions were found to be. Additionally, a good complementarity between the microrheology (DWS) and macrorheology (mechanical rheometer) data was found. Our work suggests that DWS is a highly attractive method to investigate the stability, aging and microrheology properties of cellulose-based emulsions, providing valuable insights on their microstructure. This technique is thus highly appealing for the characterization and design of novel emulsion formulations.
漫射波谱学（DWS）是一种强大的光学技术，适用于以非破坏性和可重复的方式研究混浊样品，提供有关系统静态和动态特性的信息。这包括乳状液滴随时间的相对位移和粘弹性的变化。在这里，首次通过 DWS 对新型有前途的纤维素基油包水（O/W）乳液进行了研究。纤维素作为一种新型的环保乳化剂。水解时间观察到影响乳液液滴的平均粒径及其稳定性；水解时间越长，发现乳液越分散且稳定。此外，微流变学（DWS）和宏观流变学（机械流变仪）数据之间存在很好的互补性。我们的工作表明，DWS 是一种非常有吸引力的方法，可以研究基于纤维素的乳液的稳定性、老化和微流变学特性，为其微观结构提供有价值的见解。因此，该技术非常适合于新型乳液配方的表征和设计。
